Octal to Hex Converter
Enter an octal number to instantly convert it to hexadecimal, plus decimal and binary outputs.
Last updated: May 30, 2026
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Buy me a coffeeWhat is Octal to Hex Converter?
Octal (base 8) and hexadecimal (base 16) are both common in computing, but they are used in different contexts: octal in Unix permissions and some legacy systems, hex in memory addresses, color codes, and network data.
Converting octal to hex involves finding the same integer value expressed in base 16. The cleanest path is via decimal (or binary): convert each octal digit to its 3-bit binary equivalent, then regroup the bits into 4-bit nibbles for hex.
For example, octal 377: - 3 → 011, 7 → 111, 7 → 111 → binary 011111111 - Regroup as nibbles: 0 1111 1111 → FF - So 377 (octal) = FF (hex) = 255 (decimal)
How to Use Octal to Hex Converter
Type or paste an octal number in the input field (only digits 0–7).
The hexadecimal, decimal, and binary outputs update instantly.
Click any copy button to copy the result to your clipboard.
Click "Load Sample" to see an example.
Common Use Cases
- Converting Unix file permission masks from octal to hex for use in hex-based configuration tools.
- Cross-referencing number base outputs in computer science labs.
- Embedded systems work requiring octal-to-hex translation for register values.
Example Input and Output
Octal 377 converts to hexadecimal FF — both represent the decimal value 255.
377FFData Privacy
All conversions run entirely in your browser. No data is sent to any server.
Frequently Asked Questions
Why is octal 377 the same as hex FF?
Both represent the decimal value 255, which is the maximum value for an 8-bit unsigned byte (all bits set to 1). The notation differs by base: 255 in decimal = 377 in octal = FF in hex = 11111111 in binary.
Are leading zeros allowed?
Yes. Leading zeros (e.g. 0377) are automatically stripped before conversion.
Is the hex output uppercase or lowercase?
Uppercase (A–F). This is the standard convention for hex values used in most technical contexts.
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